From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA642C4332E for ; Fri, 20 Mar 2020 05:15:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AA4DB20722 for ; Fri, 20 Mar 2020 05:15:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726892AbgCTFPo (ORCPT ); Fri, 20 Mar 2020 01:15:44 -0400 Received: from baldur.buserror.net ([165.227.176.147]:45018 "EHLO baldur.buserror.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725446AbgCTFPo (ORCPT ); Fri, 20 Mar 2020 01:15:44 -0400 Received: from [2601:449:8480:af0:12bf:48ff:fe84:c9a0] by baldur.buserror.net with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1jF9tu-0000dq-Qb; Fri, 20 Mar 2020 00:08:55 -0500 Message-ID: From: Scott Wood To: Jason Yan , mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, diana.craciun@nxp.com, christophe.leroy@c-s.fr, benh@kernel.crashing.org, paulus@samba.org, npiggin@gmail.com, keescook@chromium.org, kernel-hardening@lists.openwall.com Cc: linux-kernel@vger.kernel.org, zhaohongjiang@huawei.com, dja@axtens.net Date: Fri, 20 Mar 2020 00:08:53 -0500 In-Reply-To: <20200306064033.3398-7-yanaijie@huawei.com> References: <20200306064033.3398-1-yanaijie@huawei.com> <20200306064033.3398-7-yanaijie@huawei.com> Organization: Red Hat Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 2601:449:8480:af0:12bf:48ff:fe84:c9a0 X-SA-Exim-Rcpt-To: yanaijie@huawei.com, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, diana.craciun@nxp.com, christophe.leroy@c-s.fr, benh@kernel.crashing.org, paulus@samba.org, npiggin@gmail.com, keescook@chromium.org, kernel-hardening@lists.openwall.com, linux-kernel@vger.kernel.org, zhaohongjiang@huawei.com, dja@axtens.net X-SA-Exim-Mail-From: oss@buserror.net Subject: Re: [PATCH v4 6/6] powerpc/fsl_booke/kaslr: rename kaslr-booke32.rst to kaslr-booke.rst and add 64bit part X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on baldur.buserror.net) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2020-03-06 at 14:40 +0800, Jason Yan wrote: > @@ -38,5 +41,29 @@ bit of the entropy to decide the index of the 64M zone. > Then we chose a > > kernstart_virt_addr > > + > +KASLR for Freescale BookE64 > +--------------------------- > + > +The implementation for Freescale BookE64 is similar as BookE32. One similar to > +difference is that Freescale BookE64 set up a TLB mapping of 1G during > +booting. Another difference is that ppc64 needs the kernel to be > +64K-aligned. So we can randomize the kernel in this 1G mapping and make > +it 64K-aligned. This can save some code to creat another TLB map at early create -Scott